Article
Chemistry, Physical
Tong Li, Zhenting Yang, Chenghui Xu, Xinsheng Xu, Zhenhuan Zhou
Summary: In this work, the crack propagation of 2D decagonal QCs is studied using a fracture phase field method. The damage of QCs near the crack is evaluated using a phase field variable, and the crack topology is described by this variable and its gradient. Numerical examples simulate the crack propagation paths of 2D QCs and investigate the effects of the phason field on the crack growth behaviors. The interaction of double cracks in QCs is also discussed.
Article
Computer Science, Interdisciplinary Applications
Ali O. Ayhan, Oguzhan Demir
Summary: The study conducted experiments and numerical simulations on mixed mode I/II/III fatigue crack growth, evaluating a new 3-D fracture criterion for its applicability in 3-D mixed mode fatigue problems. The developed criterion showed better predictability for crack growth surface under highly mixed mode conditions, reducing deviation from experimental surface compared to other criteria.
COMPUTERS & STRUCTURES
(2021)
Article
Materials Science, Composites
Ashish K. Bangaru, Bent F. Sorensen, Lars P. Mikkelsen
Summary: This study investigates the microscale fatigue damage evolution of off-axis tunnelling cracks in non-crimp fabric composites used in wind turbine blades. The height of the tunnelling cracks was found to vary in different layers of the laminate. Additionally, the mode of crack extension was found to depend on the orientation of the backing fibers in the presence of backing.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Miao Xinting, Jiang Chenyang, Zhou Changyu, Peng Jian, Gao Guangfan
Summary: This paper investigates the effects of specimen type and thickness on fracture parameters for mixed mode cracks, showing the significant impact of coupling effect and mode I component on crack tip field and fracture behavior. It is suggested that a new mixity parameter considering the coupling effect is needed to describe mixed mode cracks accurately. Additionally, the paper emphasizes the influence of specimen type over thickness on constraint for mixed mode cracks.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Engineering, Civil
M. A. Hussien, M. Moawad, M. H. Seleem, H. E. M. Sallam, H. M. El-Emam
Summary: In this study, the fracture toughness of fiber-reinforced concrete was experimentally determined using matrix cracked specimens. A comparison was made with traditional through-thickness cracked specimens. The results showed that the matrix cracked specimens provided a more realistic estimation of fracture toughness and the effect of fiber length on toughness was marginal.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
K. H. Leong, F. Yusof
Summary: The study found that the thickness affects the crack tip constraint of deep and shallow cracks by changing the shape of the plastic zones and the normal stresses at the crack tip. Increasing thickness while maintaining the ratio of B/(W-a) leads to a marginal increase in normal stresses at the crack tip and reduction in toughness of the shallow cracked geometries.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Automation & Control Systems
Wei Dong, Chunyan Wang, Junhui Liu, Jianan Wang, Ming Xin
Summary: This paper proposes a 3D vector guidance law to solve the open problem of three-dimensional impact time and angle guidance. The proposed guidance law is able to intercept a non-maneuvering target at the desired impact conditions, and it outperforms existing results in terms of continuous command and convenient implementation.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Engineering, Multidisciplinary
Ruifeng Zheng, Zichen Deng
Summary: This article investigates the penny-shaped and half-plane crack problems in an infinite space of one-dimensional hexagonal quasicrystals. The complete fundamental solutions of the phonon and phason fields are obtained, and important quantities on the crack plane are derived. These fundamental solutions are significant for boundary element analysis and numerical research.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Mechanical
J. A. Balbin, V Chaves, N. O. Larrosa, C. Madrigal, A. Navarro
Summary: In this study, the crack paths of hollow notched samples were analyzed experimentally, and the crack initiation points and directions were observed. The internal crack paths were also determined through the analysis of fracture surfaces. It was found that the crack initiation points were close to the maximum principal stress points at the hole contour, and the crack directions at initiation were generally close to Mode I direction.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Aerospace
A. A. Shamina, A. Zvyagin, N. N. Smirnov, A. A. Luzhin, D. Panfilov, A. S. Udalov
Summary: This study investigates the behavior of internal defects in celestial bodies, focusing on the impact of cracks under various loads. A boundary element method was used to numerically analyze the cracks, presenting a method that does not require the calculation of singular integrals.
Article
Mechanics
Kei Saito, Tei Hirashima, Ninshu Ma, Hidekazu Murakawa
Summary: A practical and reliable characteristic-tensor method (CTM) has been proposed for evaluating stress-intensity factors (SIFs) of various types of three-dimensional cracks. Using finite-element analysis, even with a relatively coarse mesh, accurate estimates of SIFs for mixed-mode crack problems can be obtained by the CTM. The results demonstrate that the CTM is a valuable approach for estimating SIFs of 3D cracks important for industrial applications.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Geological
Haijun Wang, Hanzhang Li, Lei Tang, Xuhua Ren, Qingxiang Meng, Chun Zhu
Summary: Investigating ultrasonic fracturing (UF) is important in hard rock drilling and oil and gas recovery. The 3D internal laser-engraved crack (3D-ILC) method was introduced to create two internal cracks within samples without surface damage. The characteristics of fracture surfaces were analyzed to understand the mechanism of UF. The results from numerical simulation based on the Paris fatigue model were consistent with the experimental results, indicating the effectiveness of the 3D-ILC method for UF research.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Engineering, Geological
Stephen Hedan, Valery Valle, Richard Giot, Philippe Cosenza
Summary: This study explores the mixed-mode behavior of desiccation cracks in a clayey rock gallery and the advances in digital image correlation algorithms that allow for the automatic detection of displacement jumps and sliding of cracks. The results show a linear relationship between solid phase deformation and crack porosity, and indicate that most desiccation cracks evolve in a mixed-mode with comparable shear and opening values.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Mechanics
Wu Xu, Bo Zhang, Xue-Ren Wu
Summary: This paper presents a method for calculating stress intensity factors (SIFs) of eccentric and asymmetric surface cracks and surface-corner cracks at a hole. The method, called the 3D slice synthesis weight function method (SSWFM), provides fast and accurate computation of 3D SIFs, which is useful for analyzing fatigue crack growth in complex surface and corner cracks.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Qi Shuang, Xiang WenXin, Cai LiXun, Liu XiaoKun, Shao ChunBing, Ning FangMao, Shi JinHua, Yu WeiWei
Summary: The study introduces a new theoretical method and testing approach for describing mixed-mode I-II crack-based fatigue crack propagation, and develops a novel compliance-based testing method for FCPI-II.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Mechanics
Shuhong Dong, Xiaolong Fang, Peishi Yu, Junhua Zhao
Summary: In this study, the fracture properties of nano-thickness cracked metal plates were characterized by introducing the surface effect into a theoretical model. The theoretical model showed better predictions compared to numerical simulations, and the results indicated that the surface property only has a significant influence on the stress intensity factors when the plate thickness is smaller than 10 nm.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Thermodynamics
Shanchen Li, Yang Chen, Zhihui Li, Junhua Zhao, Ning Wei
Summary: Interfacial water plays a crucial role in mediating thermal coupling between biological tissues and graphene/GO-based bio-nano devices. The presence of oxygen-containing functional groups on the surface of GO enhances interfacial interaction and promotes thermal transport efficiency. The density and distribution of hydroxyl groups affect the formation of H-bonds and subsequently impact thermal transfer efficiency at the interface.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Polymer Science
Chunhua Zhu, Ning Wei, Junhua Zhao
Summary: This study successfully describes the interactions between poly(vinyl alcohol) (PVA) melts and graphene oxide (GO), as well as their interfaces, using coarse-grained potentials. The computational efficiency is significantly improved and the method can be applied to other interfacial systems.
Article
Engineering, Mechanical
Anping Hua, Junhua Zhao
Summary: Studies have found that the change in shear direction can cause a transition from grain boundary migration to sliding in nanocrystalline metals. This transition is caused by the competition between the nucleation energies of disconnection and surface step.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Chemistry, Physical
Shuhong Dong, Haiqiang Wang, Hongrong Wu, Jun Liu, Junhua Zhao
Summary: This study reveals the crystal growth mechanism of copper nanosheet-intercalated graphene oxide (GO) interlayers using theoretical models and molecular dynamics simulations. The results show that the interlayer spacing and oxidation degree of GO play important roles in crystal growth velocities, with an increase in interlayer spacing leading to an increase in growth velocity, while an increase in oxidation degree leads to a decrease in growth velocity. Additionally, smoother surfaces are observed for nanoconfined metals.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Jin Sun, Yunfeng Dai, Linhai Huang, Junhua Zhao
Summary: The failure mechanism of 3D woven composites under compression loading after low-velocity impact was studied using experimental and numerical methods. The study found that the impact damages are direction-dependent, determined by the weft and warp orientations. The compression-after-impact tests showed that the strength along the principal direction is more sensitive to the low-velocity impact. A finite element dynamic analysis method was established, and the results revealed that the extension direction of impact damage changes with the off-axis angle, with smaller angles leading to sudden crushing failure determined by fiber failure, and larger angles leading to ductile failure governed by accumulated matrix failure.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Nanoscience & Nanotechnology
Hongrong Wu, Pinsen Tong, Na Li, Xiaocheng Zhou, Ning Wei, Junhua Zhao
Summary: This study achieved the transition from horizontal MoO2 nanosheets to vertical MoO2 nanofins on c-Al2O3 substrate using atmospheric pressure chemical vapor deposition. The growth mechanism of vertical MoO2 nanofins was revealed, and their high electrical conductivity and potential applications were demonstrated.
ACS APPLIED NANO MATERIALS
(2022)
Article
Engineering, Mechanical
Zhiyang Guo, Peishi Yu, Yu Liu, Junhua Zhao
Summary: This study develops testing techniques and investigates the performance evolution of direct-ink-writing printed sensors under different strain ranges. The results show that moderate fatigue strain can enhance the sensitivity and stability of the sensors, which is of great importance for engineering applications.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Composites
Linhai Huang, Jin Sun, Diantang Zhang, Junhua Zhao
Summary: The dynamic mechanical behaviors of [0(2)(degrees)/90(2)(degrees)](4s) fiber-reinforced composite laminates under double-position low-velocity impacts are investigated using the finite element method. The interference effect of impact damage is studied by impacting two positions symmetrically with different distances and energies. The results show that the maximum displacement is a suitable parameter for characterizing the degree of damage interference.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Chemistry, Physical
Yi Yang, Shanchen Li, Junhua Zhao, Chao Zhang, Ning Wei
Summary: In this paper, the thermal behaviors of diamondene are investigated using molecular dynamic simulation, and the effects of orientation, temperature, hydrogenation, and defect on the thermal conductivity are considered. The study found that the thermal conductivity of diamondene is sensitive to strain engineering but almost independent of surface chemical functionalization. The results of this study provide fundamental understanding of thermal transport in diamondene.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Polymer Science
Chunhua Zhu, Junhua Zhao
Summary: This study reveals the influence mechanism of entanglements on the crystallization of polymer melts under cyclic stretching through molecular dynamics simulations and primitive path analysis. The results show that the polymer melts prefer to nucleate in the less-entangled regions. The nucleation rate and crystal growth rate of polymers decrease exponentially and linearly with increasing entanglement density, respectively.
Article
Nanoscience & Nanotechnology
Hongrong Wu, Pinsen Tong, Baowen Li, Maolin Tang, Ning Wei, Junhua Zhao
Summary: In this study, high ductility and strain-insensitive conductivity were found in chemical vapor deposited MoO2 nanofins, providing opportunities for their application in flexible electronics.
ACS APPLIED NANO MATERIALS
(2023)
Review
Engineering, Mechanical
Jiachao Ji, Yulin Jin, Anping Hua, Chunhua Zhu, Junhua Zhao
Summary: Carbon nanotube (CNT) networks can be used as building blocks for synthesizing novel advanced materials and exploiting the superior properties of individual CNTs. Multiscale analyses, including atomic, nano, and meso structures, are employed to study the load transfer mechanisms and material deformation in CNT networks. The multiscale theories provide insight into the optimal assembling of CNT network materials for elevated mechanical performance.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Jin Sun, Yunfeng Dai, Linhai Huang, Diantang Zhang, Junhua Zhao
Summary: In this study, the low-velocity impact damage behavior and influencing factors of 3D woven composites were investigated experimentally and numerically. The results showed that the damage exhibited significant directionality, which was closely related to the weft/warp orientation of the composites. The distribution shape of the yarns played an important role in absorbing impact deformation and strengthening the structure during loading. Furthermore, the directional impact damage significantly affected the post-impact performance.
Article
Chemistry, Physical
Ning Wei, Yang Chen, Kun Cai, Yingyan Zhang, Qingxiang Pei, Jin-Cheng Zheng, Yiu-Wing Mai, Junhua Zhao
Summary: This study systematically investigated the effects of creases on the thermal properties of graphene origami using molecular dynamics simulations. The results showed that tensile strain reduces the interfacial thermal resistance due to the presence of creases. This finding has important implications for the design of next-generation thermal management devices and flexible electronics with tuneable properties.
GREEN ENERGY & ENVIRONMENT
(2022)